Question 1

Enzyme repression typically affects catabolic pathways.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following do NOT bind to the promoter sequence during regulation?

Accepted Answer

A)  activators 
B)  inducers 
C)  repressors 
D)  None of these bind directly to the promoter sequence. 
A)  activators 
B)  inducers 
C)  repressors 
D)  None of these bind directly to the promoter sequence.

Question 3

The residues in a DNA-binding protein that interact with DNA usually correspond to each other according to the amino acids encoded by the DNA. For example, a DNA sequence containing AGC-AGA-CAG which encodes for Ser-Arg-Gln would likely have a DNA-binding protein with the sequence Ser-Arg-Gln.

Accepted Answer

A) True 
 B)False

Question 4

Many of the virulence factors produced by the opportunistic pathogen Pseudomonas aeruginosa are the result of quorum sensing. What role do autoinducers play in this mechanism of bacterial pathogenicity?

Accepted Answer

Through the use of autoinducers, bacteri

Question 5

Chemotaxis in bacteria occurs through the use of

Accepted Answer

A)  adaptation. 
B)  quorum sensing. 
C)  autoinduction. 
D)  a modified two-component system. 
A)  adaptation. 
B)  quorum sensing. 
C)  autoinduction. 
D)  a modified two-component system.

Question 6

PII proteins are a family of signal-transducing proteins that regulate ________ during nitrogen metabolism.

Accepted Answer

A)  transcription factors. 
B)  enzymes. 
C)  membrane transport proteins. 
D)  PII proteins regulate each of the above during nitrogen metabolism. 
A)  transcription factors. 
B)  enzymes. 
C)  membrane transport proteins. 
D)  PII proteins regulate each of the above during nitrogen metabolism.

Question 7

In catabolic repression, cells always use the least abundant carbon source first.

Accepted Answer

A) True 
 B)False

Question 8

Most riboswitches control

Accepted Answer

A)  transcription. 
B)  translation. 
C)  ribosome synthesis. 
D)  tRNA synthesis. 
A)  transcription. 
B)  translation. 
C)  ribosome synthesis. 
D)  tRNA synthesis.

Question 9

Two common levels of regulation of protein activity are transcriptional control and posttranslational control. Discuss the differences between the two in terms of speed of response and energy efficiency.

Accepted Answer

Transcriptional control will be the slow

Question 10

During chemotaxis, attractants increase the rate of autophosphorylation, whereas repellants decrease this rate.

Accepted Answer

A) True 
 B)False

Exam 6: Microbial Regulatory Systems

Enzyme repression typically affects catabolic pathways.

Which of the following do NOT bind to the promoter sequence during regulation?

The residues in a DNA-binding protein that interact with DNA usually correspond to each other according to the amino acids encoded by the DNA. For example, a DNA sequence containing AGC-AGA-CAG which encodes for Ser-Arg-Gln would likely have a DNA-binding protein with the sequence Ser-Arg-Gln.

Many of the virulence factors produced by the opportunistic pathogen Pseudomonas aeruginosa are the result of quorum sensing. What role do autoinducers play in this mechanism of bacterial pathogenicity?

Chemotaxis in bacteria occurs through the use of

PII proteins are a family of signal-transducing proteins that regulate ________ during nitrogen metabolism.

In catabolic repression, cells always use the least abundant carbon source first.

Most riboswitches control

Two common levels of regulation of protein activity are transcriptional control and posttranslational control. Discuss the differences between the two in terms of speed of response and energy efficiency.

During chemotaxis, attractants increase the rate of autophosphorylation, whereas repellants decrease this rate.

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